In People v. Brisco, 15 Mich App 428, 429; 166 NW2d 475 (1968), the Court stated: It has been ruled in Michigan that evidence exhibited to the jury but not offered or introduced is to all intents and purposes considered as evidence. The use of evidence in court inadmissible by direct offer, cannot be condoned--entry through the back door cannot be allowed where entry through the front door has been refused.